exercice-JavaScript/try.html at master · charaf12-u/exercice-JavaScript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script lang="JavaScript">
        let ch = prompt('entrer un note : ')
        try{
            if(ch=="") throw 'ettention note vide !!!!'
            if(isNaN(ch)==true) throw 'ettention entrer un nember !!!!'
            let note = +ch
            if(note<=0) throw 'ettention !!!!   enter un note >=0'
            if(note>=20) throw 'ettention !!!!   enter un note <=20'
            window.alert('note est valide')
        }
        catch(err){
            window.alert(err);
        }
    </script>
</body>
</html>